Automatic miniature enlarger



July 31 1945- c. a YouNG BERG 2,380,818

AUTOMATIC MINIATURE ENLARGER Original Filed Jan.- 27, 1939v 4Sheets-Sheet 1 fffffffffff a Attorney 4, om f. rou/v6 5MG Vd L [By C I.

July 31, 1945.

c. E. YOUNG BERG AUTOMATIC MINIATURE ENHLARGER original Filed Jan. 2?-,19:59

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July 31 1945- c. E. YOUNG BERG AUTOMATIC MINIATURE ENLARGER OriginalFiled Jan. 27, 1939 4Sheets-Sheet I5 a CA ADL E. Y0U/v6 9E/QG y @.wkfw/g( orwey.A

July 31, Q E YOUNG BERG I l AUTOMATIC MINIATURE ENLARGER Original FiledJan. 27K.' A1939 4 Sheets-Sheet 4"y gg. 76 77 ZZ 20v-f f/O l 20m2 23 225 ma 72 m figa f Y Y //4 f .figuv Tf1 veww. C A/JL t yam/655% C m M 'Bgptorney.

Patented July 3 1, 1945 2,380,818 AUTOMATIC MINIATURE ENLARGER Carl E.Young Berg, Los Angeles, Calif.

Original application January 27, 1939, Serial No. 253,190. Divided andthis application August 16, 1943, Serial No. 498,863

Claims.

This invention relates to a photographic enlarging apparatus,particularly but not necessarily used in connection with miniatures, andis a division of my co-pending application, Serial No. 253,190, tiledJanuary 27, 1939 now become Patent Number 2,327,086, issued August 1'7,1943.

An object of the invention is to provide such 'an apparatus whereinprovision is made for positive automatic focus in order that rapidchange of focus may be eiected as desired where large quantities ofminiatures or equivalents are made.

Another object is to provide a novel structure which may be adjusted soas to handle work of various sizes and proportions.

More specific objects and advantages will 'become apparent from aconsideration of the description following, taken in connection withaccompanying drawings illustrating an operative embodiment.

In said drawings:

Figure 1 is a view in side elevation showing one form of the invention,the parts being shown in printing position;

Figure 2 is a vertical section taken on the line 2-2 of Figure 1;

Figure 3 is a horizontal section taken on the line 3-3 of Figure 1;

Figure 4 is a horizontal section taken on the line 4-4 of Figure 1;

Figure 5 is a horizontal section taken on the line 5 5 of Figure 1;

Figure 6 is a detail fragmentarily showing the top of the table and maskthereon;

Figure 7 is an enlarged detail on the same plane as Figure 2 of theupper parts shown in that gure;

Figure 8 is a fragmentary, enlarged longitudinal section through aportion of the control rod;

Figure 9 is a view similar to Figure 8 but showing the parts of thecontrol rod released;

Figure 10 is a bottom end view of the upper hollow section of thecontrol rod:

-Figure 11 is a side elevation on a smaller scale than Figure 1 showingthe parts in open position;

Figure 12 is a vertical section on the plane of line I2I2 of Figure 13;

Figure 13 is an enlarged plan view of the shield means for theafterglow;

Figure 14 is an elevation of the enlargement size chart, taken on theline I4-I4 of Figure 1;

Figure l5 is a detail section taken on the line I5-I5 of Figure 1;

Figure 16 is a side elevation of a modified form of the invention;

Figure 17-is a horizontal section taken on the line I1-I'I of Figure 16;

Figure 18 is a vertical section taken on the line I8-I8 of Figure 16,and

.Figure 19 is a vertical section taken on the line I9-I9 of Figure 18;

Figure 20 is a vertical section taken on the line 20-20-of Figure 12;

Figure 21 shows assembly of focusing means; Figure 22 shows assembly ofcamera frame and supporting parts.

Referring specifically to the drawings and first to the form disclosed.in Figures l to 15, Ill designates a cabinet or table having a top" I Iprovided with a. central rectangular'opening therethrough adapted to beilluminated by'an electric lamp or the equivalent I2 within a lamphousing I3. Over such opening in the top II, a miniature or othernegative I4 is disposed, the opening preierably being provided with atransparent glass panel on which such negative I4 rests. A mask I5 ofsuitable size may also rest on the glass panel, having an appropriatecentral opening as shown at I6, to expose the negative I4 and overlapthe marginal edge portion of such negative.

Rising rigidly from the tabletop II is a hollow column I1. Extendinginto the hollow column is a tubular section 02. A platen or frame I9 forthe sensitized paper or equivalent normally rests on the tubular section|02. Such platen, as best shown-in Figure 4, has an opening 20therethrough which is covered by a panel of transparent glass 2l. Acrossthe top of the glass panel 2 I, which panel is vertically aligned withthe negative I4, a sensitized paper or equivalent is disposed when acover or plate 22 is open as shown in Figure 11. Such cover or plate 22is pivoted at 23 to the platen I9.

Between the top II and platen I9, a suitable camera device 24 isdisposed and operable at the proper or correct focus, which latter isautomatically maintained regardless of the position or adjustment of theparts within the operative limits.

A mirror or reflector 25 may be fastened on the column I1, to aid in thepositioning of the sensitized paper on the platen I9.

Reverting to the camera 24, it is carried by a frame 26 which is pivotedat 21 to the tabletop II. Such camera 24 may be of any conventionaltype, preferably having an accordion casing as shown and suitable lensmeans at 28. Frame 26 has a supporting post III; attached to said postis a vertical grooved track |30. Lens means 28 has a supporting arm |00provided with a vertical slidable lip tting into the vertical groovedtrack |30. Lens means arm also rests on an expansion leaf spring |0I,thus keeping lens means expanded, such expansion controlled by meanshereafter described. Suchlens means is conventional and is manuallyadjustable for obtaining the correct focus by a drum |04 and operates asfollows: A flexible cable or other elementv3| is threaded through hole|01 and fastened securely by screw |05; screw end of drum |04 is passedthrough hole |09 of lens supporting arm |00. Drum |04 is held againstarm |00 by adjusting nut |09, forcing spring |03 againstwasher |06 thusfrictionally clamping arm |00 between drum |04 and washer |06. A handwheel |00a is attached to screw end of drum |04 and is fastened rigidlyby nut IIO. As drum I04Vis turned by hand wheel |09a to adjust the focusof lens means, cable element 3| is wound or unwound on the drum thuspulling down or releasing the lens means opposed by spring |0| andspring |03 supplies the tension necessary to hold the drum adjustably inposition. When cable 3| is pulled by drum 69 drum |04 is not rotated butlens means 29 is pulled down. The connection of movement of the rod 33by a suitable means and permitted to open as said rod 33 raises, suchconnections being conventional.

To cut olf afterglow, a shield is provided at ||2, pivoted at |25 whichis movable laterally over and above the lens means 26, such shield beingshown in a, closed position in Figure 13, and being urged to thatposition by. a. rocker arm I|4, pivoted at I5, connecting with a bar ||6and pivoted at ||1. 'I'he bar ||6 is in turn attached to shield !|2 andpivoted at II6. Rocker arm I4 has' an elongated slot fitted over lug 40of the control rod 32. At ||9 is shown an elongated slot in frame 26 ofsufficient depth to permit lug 40 a downward motion to force rocker armII4 into a lateral position as shown at |20, forcing shield ||2 intolateral position as shown at |2I, all of which takes place with adownward motion of the camera. As the control rod 32 reaches the limitof its downward movement it contacts the light I2 and an uninterruptedillumination reaches the sensitized i material on platen I9. However,when the conthese means 'will be described later, operating toautomatically maintain the Vproper or correct focus of the lens means 28and camera at all times and regardless of the angle of the camera andadjustment of the parts within operative limits,

Vertically operable within the column I1 is a control rod 32 made up ofa number of sections and relatively adjustable for lengthening orshortening. This control rod has a lower section 33 pivoted at 34 to atreadle 35, in turn pivoted at 36 to the table or cabinet I0 andnormally maintained in uppermost position by a leaf spring 31 fastenedto such cabinet. Section 33 is screw threaded or otherwise fastened at38 to a tubular section 39 having lugs 40 projecting therefrom throughelongated slots 4| in the column 'I1 and elongated slots 4 2 in theframe 26.

Extending into the tubular section 39, is a tubular section 43 which isadapted to be adjustably secured to the section 39 according to theheight or position desired for the platen I9 to cover 22. The lower endof section 43 is split as at 44, Figures B, 9 and l0, and a rod 45 isslidable in the bore of section 43 and has a tapered enlargement 46 atone end and a cam 41 pivoted to the other end at 49. Normally section 43is slidable in section 39, but when the cam 41 is operated against theupper end of section 43, rod 45 is pulled relatively to section 43,causing the enlargement 46 to spread the lower end of section 43 intotight frictional contact with the bore wall of section 39, whereby theentire rod device 32 will operate as a unit.

Platen I9 is fastened rigidly but adjustabl'y to the tubular section|02, as by a screw 49. The

upper section of control rod 43 has lugs extending laterally therefromthrough elongated slot 5I in cover plate 22.

To facilitate vertical adjustment of the platen I9, a rack bar 52depends from the latter and is engageable by a pinion 53 carried by amanually operable shaft 54 journaled in extensions 55'in a band`56secured to the columnl1 bya screw 51. The aforesaid mirror 25 ispreferably carried by said band 56.

The said lamp I2 is adapted to be under control of a switch which isopened upon downward vparts in proper and accurate focus.

trol rod 32 returns into an upward position,'it cuts off the contactof-light I2, forces the rocker arm ||4 to move shield I|2 back into itsnormal position, thereby cutting oil afterglow, and then contacts frame26, lifting camera into an upward position.

Reverting to the cord or other exible element 3|, it is trained over aguide pulley or the equivalent as at 61 on the frame 26, and such cableor flexible element 3| is fastened as at 68 to a rotatable drum 469having a cam groove 10 therein. A rod 1| is disposed centrally withinthe drums 69 and mounted and suspended from the platen I9 by means of abracket 12. A projection or lug 13 extends laterally from rod 1| throughthe cam groove 10 and has an indicator 14 thereon movable over a chart15 fastened by a bracket |03 to the table or cabinet I0. It will berealized that the parts are mathematically figured, constructed andarranged, so that at all adjustments and conditions of operation theindicator 14 will indicate the enlargement size of the print being madeat the platen I9 on the chart 15, and that the drum 69 .will co-act withthe flexible element 3| so as to automatically maintain the lens andDrum 69 has a button 16 rotatably 4mounted in a fork 11, :gd 1|depending rotatably through such but- As the ca m 41 is released, platenI9 may be raised to any desired position by rack bar 52 operated bypinion 53 on shaft 54, thus rod 1| rigid 1y attached to bracket 12attached to platen I9 is forced upward, lug 13 forces drum 69 to rotatein relation to cam groove 10 to wind cable 3| thereon and pull down lensmeans 23 against the tension of spring |0l, which is mathematicallyfigured at the same curvature as the curvature ofthe lens of the camera.

In ,order to maintain an accurate count of orders printed and maintainall prints in relation to their respective orders. a numbering stamp 11is provided on cover plate 22, the same being adapted for depression tobe operated through contact of lever 16, and is pivoted at 19 on a barsecured to cover plate 22. Said lever 19 is rocked as the cover plate 22closes through contact with a finger abutment screw 8| rising from anarm |22 and fastened to platen I9 at |23 and being pivoted at thatpointto permit a sideways motion, thereby yoperator can disengage or engagethe operation of numbering at will.

As a result of the construction described, when treadle is depressed,the control rod .32 will be moved downwardly accordingly with the lugs,50, moving the cover 22 onto the platen I9 to secure the sensitizedpaper therein and also moving frame 26 and camera 24 on the Aaxis 21from the position lof Figure 11 to the position of Figure l, the lamp I2being automatically lighted through the closing of the switch as controlrod 43 moves downwardly. As such parts move downwardly lug forces therocker arm I I4 to move shield I I2 into a lateral position, permittingillumination to reach sensitized paper. During this action, aspreviously described, the cable 3| in combination with the drum andassociated parts. will maintain the proper focus automatically. Aftercompleting exposure, lug 40 forces rocker arm H4 to move shield II2 intoits normal position, thus preventing afterglow. It `will be particularlynoted that, regardless of the adjustment of the parts, and particularlythe platen within the limits of adjustment, the lifo-cus will beautomatically maintained.

Various changes may be resorted to provided they fall within the spiritand scope of the invention. For instance, the form of Figures 16 to 19may be resorted to, In this form, a table or cabinet is provided as at8U having a column 8| rising therefrom in which another column 82 isadjustably secured by a screw 33. A bracket 84 is adjustable along thecolumn 82 and secured thereto through the binding engagement of a screw85 therewith. A pulley 86 is slidable along the column 82 and rotatableon the same to a limited extent, limited through the engagement of aprojection 81 on the pulley in a cam slot 88 of the column 82. Lugs 89on arms 90 of the bracket 84 causes the pulley to follow the movement ofthe bracket along the column 82.

Said arms 9D are in parallelism and support a conventional camera 9Ihaving lens means 92 at the lower end with focus adjusting means 93 ofconventional form therefor. To such means 93, a cable or exible element94 is connected as at 95, the cable passing over a guide pulley or thelike 96 fastened to one of the arms 9i) and being trained over andconnected at its other end to the pulley 86, A lamp housing 91 isdisposed above camera 9i and a negative is adapted to be disposed at thebase of the lamp housing in a suitable frame 98, and thus between thelight source and the lens 92. In this instance, the sensitized paper orthe like 99 is disposed on the table 80.

In the use of the device of Figures 16 to 19, the

bracket and all parts carried thereby is adapted for vertical movementon the column 82 upon loosening the screw 85, in order to obtain thedesired size enlargement. It will be clear that through such movement,the pulley 8G will be rotated slightly by the cable 94 as well as slidealong the column, due to the co-action of the projection 8l in the camslot 88, so that regardless of the position of the parts withinoperative limits, the focus will be automatically maintained.

secured to said table, a platen having a light aperture for a positiveadjustably secured for vertical movement on said pedestal, lens meansand a resilient support therefor on said table, and

means to vary the position of said lens with respect to said table whensaid platen is varied in position with respect to said table, said meansincluding a drum on said lens support, a cable secured to said drum, aroller rotatably mounted on said table having a portion of said cablewound thereon, a cam slot in said roller, and a rod secured to saidplaten having a lug adapted to engage said cam.

2. Photographic reproducing apparatus as described comprising incombination a iixed table having a light aperture for a negative, apedestal secured to saidtable, a platen having a light aperture for apositive adjustably secured for vertical movement on said pedestal, lensmeans and a resilient support therefor on said table, means to vary theposition of said lens with respect to said table when said platen isvaried in position with respect to said table, said means including adrum on said lens support, a cable secured to said drum, a rollerrotatably mounted on said table having a portion of said cable Woundthereon. a cam slot in said roller, and a rod secured to said platenhaving a lug adapted to engage said cam, and means to indicate the sizeof said positive, said last means including a scale and an indicatingarm adapted to pass over said scale and secured to said cam lug.

3. Photographic reproducing apparatus as described comprising incombination a fixed table having a light aperture for a negative, apedestal secured to said table and adapted for vertical adjustment withrespect thereto and having a platen for a positive, a rack bar securedto said platen and a pinion on a manually actuated shaft to effect saidadjustment, lens means and a support therefor pivotally supported onsaid table, a cover plate for said platen, means 4connected to saidcover plate and lens means support adapted to raise the same for placingand removing said negative and positive, said means comprising anadjustable length rod and a spring balanced pedal, a shutter for saidlens having actuating means connected to said rod so as to be actuatedthereby, means for varying the position of said lens on its support whenthe position of said platen is varied, said last means including a drumon said lens means support, a cable on said drum, a roller pivotallymounted on said table having a portion of said cable wound thereon andhaving a cam slot, and a rod secured to said platen and extendingthrough said roller having a cam engaging f lug.

4. Photographic reproducing apparatus as described comprising incombination a iixed table having a light aperture for a negative, apedestal secured to said table, a platen having a light aperture for apositive adjustably secured for vertical movement on said pedestal, lensmeans and a resilient support therefor on 'said table, and means to varythe position of said lens with respect to said table when said platen isvaried in position with respect to said table, said means including arotatable drum frictionally engaging said lens support, a cable havingan end portion wound on said drum and being under tension from saidresilient support, a roller rotatably mounted on said table having aportion of said cable wound thereon, a cam slot in said roller, and arod secured to said platen having a lug adapted to engage said cam, saiddrum adapted to be manually rotated to wind or unwind the cable thereonto move said lens means with respect to said table.

5. Photographic reproducing apparatus as described comprising incombination a :fixed table having a light aperture for a negative, apedestal secured to said table and adapted for vertical adv justmentwith respect thereto and having a platen for a positive, a rack barextending from said platen along said pedestal, a pinion engaging saidrack and having a shaft bearing mounted on said pedestal, and providedwith a hand wheel, lens means and a support therefor pivotally supportedon said table, a cover plate for said platen, means connected to saidcover plate and lens means support adapted to raise the same for placingand removing said negative and positive, said means comprising anadjustable length rod and a spring balanced pedal, means for varying theposition of said lens on its support when the position of said platen isvaried, said last means including a drum rotatably mounted on and havingfrictional engagement with said lens means support, a drum shaft havinga hand wheel and a friction device, a cable Wound on said drum, a hollowroller pivotally mounted on said table having a portion of said cableWound thereon and having a cam slot, and a rod secured to andoscillatable by said platen and extending through said roller and havinga laterally extending cam engaging lug to rotate said roller when saidrod is oscillated.

CARL E. YOUNG BERG.

